Cephalid Facetaker 
Creature — Octopus Rogue
$4.08 #6963 0.22 4.5 years
This creature can't be blocked.
At the beginning of combat on your turn, you may have this creature become a copy of another target creature until end of turn, except it's 1/4 and has "This creature can't be blocked."
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Cards similar to Cephalid Facetaker expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Cryptoplasm90%
$0.64↓#12938↓0.44↑15.7 years↑
"At the beginning of your upkeep, you may have this creature become a copy of another target creature, except it has this ability."
Silent Hallcreeper84%
$1.19↓#1442↑0.272.1 years↓
"• This creature becomes a copy of another target creature you control."
+1 more matching line
Mindlink Mech82%
$0.27↓#11824↓0.06↓4.7 years
"Whenever this Vehicle becomes crewed for the first time each turn, until end of turn, this Vehicle becomes a copy of target nonlegendary creature that crewed it this turn, except it's 4/3, it's a Vehicle artifact in addition to its other types, and it has flying."
Volrath, the Shapestealer82%
$0.67↓#13791↓0.227.2 years↑
"
: Until your next turn, this card becomes a copy of target creature with a counter on it, except it's 7/5 and it has this ability."
: Until your next turn, this card becomes a copy of target creature with a counter on it, except it's 7/5 and it has this ability."
Artisan of Forms80%
$0.20↓#17065↓0.05↓13.1 years↑
"Whenever you cast a spell that targets this creature, you may have this creature become a copy of target creature, except it has this ability."
Irma, Part-Time Mutant78%
$4.09↑#3406↑0.45↑0.6 years↓
"At the beginning of combat on your turn, this card becomes a copy of up to one other target creature you control, except her name is this card and she has this ability. Then put a +1/+1 counter on her."
Cemetery Puca78%
$2.76↓#19936↓0.07↓18.5 years↑
"Whenever a creature dies, you may pay . If you do, this creature becomes a copy of that creature, except it has this ability."
. If you do, this creature becomes a copy of that creature, except it has this ability."
Kimahri, Valiant Guardian77%
$0.21↓#69020.00↓1.4 years↓
"At the beginning of combat on your turn, put a +1/+1 counter on this card and tap target creature an opponent controls. Then you may have this card become a copy of that creature, except its name is this card and it has vigilance and this ability."
Tilonalli's Skinshifter76%
$0.21↓#23689↓0.179.1 years↑
"Whenever this creature attacks, it becomes a copy of another target nonlegendary attacking creature until end of turn."
Cytoshape76%
$0.48↓#26622↓0.1320.5 years↑
"Choose a nonlegendary creature on the battlefield. Target creature becomes a copy of that creature until end of turn."
Permeating Mass76%
$0.34↓#18412↓0.2510.2 years↑
"Whenever this creature deals combat damage to a creature, that creature becomes a copy of this creature."
Mimeoplasm, Revered One76%
$0.31↓#14196↓0.291.7 years↓
": this card becomes a copy of target creature card exiled with it, except it's 0/0 and has this ability."
: this card becomes a copy of target creature card exiled with it, except it's 0/0 and has this ability."
Blade of Shared Souls75%
$0.25↓#12362↓0.06↓3.7 years
"Whenever this Equipment becomes attached to a creature, for as long as this Equipment remains attached to it, you may have that creature become a copy of another target creature you control."
Deepfathom Echo75%
$0.26↓#9953↓0.12↓2.9 years↓
"At the beginning of combat on your turn, this creature explores. Then you may have it become a copy of another creature you control until end of turn."
Renegade Doppelganger74%
$0.55↓#19320↓0.11↓16.5 years↑
"Whenever another creature you control enters, you may have this creature become a copy of that creature until end of turn."
Taskmaster, Mercenary Mimic74%
$0.67↓#8457↓0.35↑0.3 years↓
"At the beginning of your first main phase, until your next turn, this card becomes a copy of up to one target creature on the battlefield or creature card in a graveyard, except his name is this card and he's a legendary Human Mercenary Villain creature."
Mirror of the Forebears74%
$1.81↓#10612↓0.12↓9.2 years↑
": Until end of turn, this artifact becomes a copy of target creature you control of the chosen type, except it's an artifact in addition to its other types."
: Until end of turn, this artifact becomes a copy of target creature you control of the chosen type, except it's an artifact in addition to its other types."
Vectis Agents74%
$0.07↓#31417↓0.00↓17.7 years↑
"
: This creature gets -2/-0 until end of turn and can't be blocked this turn."
: This creature gets -2/-0 until end of turn and can't be blocked this turn."
Quicksilver Gargantuan73%
$0.51↓#18556↓0.43↑16.1 years↑
"You may have this creature enter as a copy of any creature on the battlefield, except it's 7/7."
Protean Thaumaturge73%
$0.31↓#10641↓0.00↓6.7 years↑
"Whenever an enchantment you control enters, you may have this creature become a copy of another target creature, except it has this ability."